Here's another example from a shoot I did today. The unflashed shot was just an accident - I failed to wait until my flash unit recycled. For these I used a Lumiquest Softbox on my flash unit. I like the softbox because it softens shadows and makes catchlights bigger (at the expense of considerable range and recycle time).
It was an overcast day, I was shooting at 1/200 f/5.6 ISO 100 with -1 FEC. The results should require no further explanation.